at ease vs retiring

at ease

prep
  • Allowed to refrain from being in rigid formation. 

  • Free of anxiety; not stressed or tense. 

  • In a relaxed position with the feet apart rather than at attention. 

retiring

adj
  • introverted, liking privacy and seclusion. 

noun
  • retirement 

How often have the words at ease and retiring occurred in a corpus of books? (source: Google Ngram Viewer )